Truck lock



July 5, 1955 J. A. sKUPAs 2,712,366

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United States Patent Ofi 1 2,712,366 Y TRUCK LOCK John A. Skupas,Evansville, Ind., assignor to Faultless Caster Corporation, Evansville,Ind., a corporation Application July 7, 1951, serial No. 235,632 4Claims. (Cl. 18S- 5) plied and released by applied to a selectedapplying or releasing sole of the'shoe to pedal. structure extending onwith opposed outwardly extending arms on which the pedals are mounted,an-d wherein the centering it upon the plate and resisting transverseshearing action therebebreakage and-replacement.

The full nature 'of the invention will be understood from theaccompanying drawing andclaims:

Fig. 1 is a side elevation showing a portion of a'truck with'the trucklock shown in partial vertical section and in applied position.

Fig. 2 is a side position.

Fig. 3 is a front elevation of 'the truck lock shown in Fig. l.

In the drawing there is shownva portion of a truck having a truck bed 10to which there is mounted the usual four wheels or casters, each casterhaving a mounting plate 11, caster horns or supports 12, and a casterwheel 13 normally adapted to roll over the oor or ground.

The truck lock is secured to the underside of the truck bed to extenddownwardly in a position to engage and grip the surface of the oor orground when applied, or be and the following description elevation ofthe truck lock in released 2,712,366 Patented July 5, 1955 lice movedupwardly free therefrom when released. Thus, when applied the truck lockrelieves the wheel or caster 13 as the truck support and by frictionallyengaging the lioor surface locks the truck against movement.

The truck lock as herein shown, consists of a standard comprisingtelescoping tubes, there being an upper outer 14 and a lower rinner tube15 having their adjacent The upper portion of i opposed elongated slots25 which receive a transverse of Fig. `1 to the released position ofFig. 2.

The control linkage Vcomprises a pair of bell crank levers 30,`lfulcrumed intermediate their parallel relation thereto.

Said linkage is so related that when the lock is moved to releasedposition by the spring 29 (as shown in Fig. crank lever 30 is swung onlinks 34 to one side'in collapsed relation limited by the bolt the lowerend This movement carries the releasingv pedal 35 to a substantiallyhorizontal position and throws the pivotal connection 33 between .thelevers and links over center with the inner end of the pedal 35 bearingagainst the tube 14. The over center position of the pivotal connection33 "and the limited position of vthe pedal 35 holdsthe lock 'in itsapplied position, the" relative movements: of the levers spring 29 andelongated the standard through the sliding telescopicV actionofthetubes. ln this extended applied position the-weight of the truck Aiscarried from the lower tube through the bolt 28; levers 30,' links 3426t'in'turn'supportsthe truck bed through the compression spring27 whichVmay yield to provide for self adjustment.

ofthe loclcto variable distance relation between vthe truck "bed anddoor line.

When it'is'desired to release the lock, the laterally-excomprising'upper and lower relatively. slidable tubular and links hav-ingexpandedthe and bolt 26,' the upper tube' 14 serving merely as a guide. The boltplate secured to-the .underside of sections 'depending from said platefor .locking ground y engagement, means for securing the upper end ofsaid upper' section about said boss whereby said boss providesacenterin'g reinforcement therefor against shearing andangula'rdisplacement, said upper section vhaving an axially disposed.elongated .slot adiacent and .in spaced `rela-` tion withsaid boss, ananchor bolt extending throughtand` movable within said slot, a cushionspring interposed between said anchor bolt and boss, a second anchorbolt extending 'through 'the lower tubular section, a tensionspringconnecting said bolts tending to telescope said sections; a bellcrank lever fulcrurned intermediate its ends to said last-mentionedbolt, linkage connecting -said levenwith said'tirst-mentioned bolt toprovide a toggle assernbly, a foot pedal mounted on each end otk saidlever and extending in opposite directions to opposite-sides of saidstandard, one of said pedals being movable downwardly'toswing Asaidtoggle assemblyV into aligned. over.v

centerposition, said downward movement being limited by` engagement ofsaid opposed pedal with said standard, andl said opposed pedal beingmovable downwardly under toot pressure to swing said toggle assemblyfrom over center'position to collapsed position under the tension of'being-limited i by"engagement of said 'second-mentioned bolt with the.

said tension spring, said collapsed. position upper' tubular section,tended' and 'retracted onsaid pedals, respectively,

whereby said standard will be eX-.

from said plate for locking ground engagement', means for' securing theupper end of said -upper section-ito said mounting plate, the uppersection having anaxially.' disposed elongated slot adjacent andin-'spacedrelation with last-mentioned bolt,- linkage connectingsaid-'lever -with said first-mentioned bolt to provide atoggleassernblwandend of. said lever. and l'ex-1 a footspedal mountedon-each tendingrin opposite' directions to .oppositeasidesof-Said by thedownward pressure exerted into and out of' ground enga'glng lockingposition under .tension of .said cushion.

wheel :truck having -a truck bed.

said mountingplate, an anchor bolt.extending-through-.V andmovablewithin' said slot, a cushion-spring interposed' between saidanchor bolt and plate,.a second-anchor:bolti extending throughthe lowersection, a tension :spring con. necting said bolts tending totelescope-'saidsections, a bell crank lever 'fulcrurnedintermediate-.its Sends? to-said-- sion' or- -said: tension spring,

` side 0f said standard from the otheriendofsaidl lestandardyoneof.saidpedalsbeingmovabledownwardlyto swing said toggleassembly into aligned over center position, said opposed pedal lying inan offset parallel plane to said rst pedal and movable downwardly underfoot pressure to swing said'toggle" 'assembly from over said centerposition to-collapse'd position'under the" tension" ot said tensionspring; said collapsed' position" being limited by engagement of saidsecond-mentioned bolt with the upper tubular section, whereby saidstandard will be extended-and .retracted by the downward 'pressure-exe'rte'd oni-said pedals, respectively, into and out-.ofground-engav-sing ..locl.ing.positionunder tension .ofsaid cushionspringe- 3. A truck lock for a wheel truck having a truclt.shed-:.4comprising-.a telescopic-r standard -includ'ingrupperxand lowerrelatively slidable. tubular` sections.'dependingefronm saidbed forlocking .ground `engagernent; meanslfor se@- curing. .the upper end ofithe uppensection'tofsaid:.bed said upper section havingganf axiallyfdisposedf-.elongated slot adjacent the --upper end: thereof, an.anchor=.--boltf.'ex. tending throughand movable 4within `sa'idfslotfacushion a spring-interposed between said anchor-lbolt and tru'ckf-f.bed, zl second anchor. bolt extending ithroughu-.theslower tubularsection;l a .tension spring'tconnecting salda-bolts-v tendingapotelescope -said sections-:a bel-l'fcrankleverf-ful;rcr-umed intermediateits ends to said last-mentioned-'bolt-,.-. linkage connecting saidlever--withsaidvv first-mentioned* bolt-toY provide ya toggleassembly,and a pair `of.opp'osed'-- foot pedalssecuredfto said-lever to extendini-opposite dif. rections and from opposite sides of said leverrinAoffset: substantially parallel planes, -oneof saidv pedalsbeing-.'movable downwardly to swing said' toggleiassem-bly into?-y alignedovercenterposition and fsaid opposed-pedalrbeing movable downwardly/to swingsaid to'ggle assembly fromw l over: centerposition tocollapsed-positionunder the -teni whereby said standard will-:lne-extended and retracted bythe downward .pressureexuertedron isaidpedals, respectively, -into and out of ground-. engaging lockingposition under tension of said cushion spring.:H

4.'- A truck lock. for: a wheeltruck. having a truck tbed,a telescopicstandard secured-'to th'e'underside ofsaidttruck i bed 4to 'extend'downwardly therefrom, said standard ecorn-1re prisingmpperfiand .lowerfrelatively:v slidable."tubulartlsenaltions; thevapperJ saidv sectionbeing secured:-to'-meu1nderv siderofs-said truck :bedg .fan'anchor-.bolt-Lextendingthrough? saidcupper:sectionfadjacent theupperi'end-.Ithereofa l'sec' ond anchor; .bolt :extending'.throughzthe'. lower? .section-,A Aa i tension spring zccmn'ectingsaidboltsltendingfxtoteleseope said-'secouriste .bellcrankleverssfulcrum'edi:intermediatefr itsendswtosa'dlastrnentioned-bolt,-La linkf'conltectiniglonef end tof l.saidyleverfwith said .trstz-mentioned-:bolt-to -providet a toggle .assemblypa fonti pedaltsecured --to-fsa'id-J' lastmei-I tioned end of said leverextending to one sideof'said' standard fin: alignmentA withsaidflinlcwvlx'err-in' one-sposition andi at.'.rightangles.to saidllinkfv'vherllfixnts'fotltterposil tiongrsand- 1a :secondtobtpedal?extendingltotheopposlteoffset-iparallelrelationtoaidi.rstfmentenechpedl,esaid last-rrnentionertpedali-being movable' downwardlyf `to1 swing-1' said toggle assemblyinto aligned over cente'n'fpo'sitiomlf anrtsaid nist-mentioned:pedal-:being movable downwardly undernfoot. pressuret tof. swing-.isa'id:toggleiassemblyltr me" over center position to collapsedposition-under'fthestenwsioncof'said .'-"spr:in'gf,I wherebysaidfstand-a'ird fwill -beex tended and retracted by the downwardpressure exertedri saidfpedalsgrespectivcly;'intoandfoutlof-groundengaging lockingI position.

References.Cited..in.the:file of thisl'latentak UNITEDLSTATES., PATENTS-233'1467 Han-Sonotrt rf lasse 2,16i9071f Brr-er-s1f^f Ju'rfefisls'ar2,227,832"` Hei-onrasoirs-4r assassin@ Anderson-t Marffzsf-wwrf2,360,872w1 Hel-olaz; oetzaaiwlw

